It would take nearly two years to impeach him. The POS should be impeached but realistically the best way to constrain him is to cut the money, put relentless pressure on his agency hacks by calling them to testify before congressional hearings, put his nomineees through the wringer, and send an endless stream of legislation to his desk. Keep the pressure on him and distract him from his radical agenda.
Yes, unfortunately (and uber unjustly), that's likely the best that can be hoped for at this point.